WO1998008341A1 - Procede et equipement pour affecter a un programme de television deja en acces conditionnel un acces conditionnel complementaire - Google Patents
Procede et equipement pour affecter a un programme de television deja en acces conditionnel un acces conditionnel complementaire Download PDFInfo
- Publication number
- WO1998008341A1 WO1998008341A1 PCT/FR1997/001502 FR9701502W WO9808341A1 WO 1998008341 A1 WO1998008341 A1 WO 1998008341A1 FR 9701502 W FR9701502 W FR 9701502W WO 9808341 A1 WO9808341 A1 WO 9808341A1
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- WO
- WIPO (PCT)
- Prior art keywords
- access
- sysb
- complementary
- conditional access
- program
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2362—Generation or processing of Service Information [SI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
- H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
Definitions
- the present invention relates to a method and equipment for assigning to a television program already in conditional access additional conditional access.
- the new television systems are accompanied by the implementation of several conditional access systems.
- the term "television” is taken in a broad sense including broadcasting or data broadcasting programs.
- “television system” will denote the technical aspects of the television signal: coding modes for images, sounds and data, descriptions of services, detailed signal syntax, modulation parameters, ...
- “conditional access system” all the functionalities affecting a television signal to express the marketing methods: scrambling methods, functions and syntax of messaging relating to the methods of marketing programs, ...
- conditional access system is essential for an operator in his choice of marketing programs, since such a system must allow him to express his commercial strategy (subscription, pay-to-see (or " pay per life ”) ); and is accompanied by a whole technical environment (commercial management of users, electronic program guide, fleet of terminals, ...) guaranteeing control of the exclusivity of its customers.
- a signal becoming multiservice becomes, by the same token, multi-conditional access system.
- the most general case of applying conditional access to a television system concerns the allocation of a conditional access system to each service carried in a signal.
- this process is generalized to multi-service digital systems: in the MPEG2 / DVB standard, this process is called MULTICRYPT. If it allows, in the same signal., The independence of the operators responsible for the various services, such a process becomes restrictive for the user who, to access the plurality of programs, must multiply the decoders or have modules of multiple conditional access pluggable on demand in a more general terminal: this is how the MPEG2 / DVB standard defined a common scrambling algorithm and defined and detailed the concept of a common conditional access interface for terminals . The implementation of a method such as MULTICRYPT is ensured during the coding function of a television signal combining coder, multiplexer, scrambler, means for inserting conditional access data.
- Figure 1 illustrates this process.
- an operator A providing a service made up of components 1 and marketing it according to modalities 1
- an operator B providing a service made up of components 2 and marketing it according to modalities 2.
- the marketing of these components is applied in equipment 10, which is an encoder / scrambler / multiplexer.
- Blocks 12 and 14 diagrammatically show programs 1 and 2 with their conditional access conditions specific to operators A and B.
- the resulting television signal is of the MULTICRYPT type.
- This implementation can also be ensured or supplemented by a transcontrol function modifying at the level of conditional access an already constituted signal.
- a transcontrol function modifying at the level of conditional access an already constituted signal.
- FIG. 2 The television signal composed of programs 1, 2 with their respective conditional access systems A and B shown diagrammatically by blocks 12 and 14, is introduced into a transcontroller 20 controlled by an operator C.
- This circuit eliminates the access conditions A and B respectively of programs 1 and 2 and replaces them with new access conditions C.
- the result is two new programs with a conditional access system C, shown schematically by blocks 22 and 24.
- a transcontroller is described, for example, in documents EP-A-0 461 029 and EP-A-0 666 694.
- Another method can be implemented, which allows access to the same program to various commercial populations (that is to say to various terminals) provided that the various operators concerned have agreed to an agreement for sharing. of such a service.
- D2-MAC / Packet and called SIMULCRYPT in the MPEG2 / DVB system
- SIMULCRYPT this process consists in associating to the same program several different conditional access systems, each of these systems being under the responsibility of an operator and allowing everyone to define their own marketing of the same program.
- this designation concerns strictly speaking, the application of this process to MPEG2 / DVB, it is by simplification that this association of several conditional access systems to the same program will be called "SIMULCRYPT" in this document, which whatever the TV support system is targeting.
- SIMULCRYPT The implementation of a method such as SIMULCRYPT is usually ensured during the coding function of a television signal.
- the subject of the present invention is a method and an equipment making it possible to assign to a program already marketed according to a first conditional access system data describing its marketing according to another conditional access system. While being adaptable to various television systems and various conditional access systems, this equipment will hereinafter be called "SIMULCRYPTOR", with reference to the SIMULCRYPT process defined in the MPEG2 / DVB standard. State of the art
- a program associated with a conditional access system calls on several entities: • the components: these are information flows representing images, sounds, teletext data, etc. ; all of these components constitute the technical aspect of the program and materialize the audiovisual content itself; the components are, if necessary, scrambled, independently of each other.
- ECM Entitlement Control Messages
- this messaging system is made up of data expressing the current conditions for marketing the service with which it is associated and called “access conditions”; therefore, it most often operates in real time, due to its synchronization with the current program, pay-to-see ("pay per view") in particular; the data of this messaging system is constantly compared with the rights already acquired by the user of the terminal, a positive comparison triggering access to the program by descrambling the chosen components; ECM messaging also carries parameters (or their reference) which particularize the functioning of the scrambling and descrambling algorithms, parameters commonly called “control word” (abbreviated to CW for "Control Word”).
- EMM Entitlement Management Messages
- this messaging system consists of data ensuring the management of the rights acquired by the user; it mainly allows the registration of rights purchased by the user (subscriptions, credit units, ...), at its terminal (or the associated security processor); apart from the fact that the registration of a right must be effective before the need for this right manifests itself (comparison to ECM), this messaging does not require fine synchronization with the program, the EMM / program link being more logical than operational.
- each component of a program can be marketed according to specific terms, or even left in the clear; in the same way, several components can be marketed in the same way, that is to say sharing the same access condition; these component links / access conditions not being defined in advance, being left to the discretion of the program operator and being moreover dynamic, they need to be constantly described in the signal: they allow thus the terminal to find the access conditions associated with the components which it must restore; they are described in a so-called "service identification" data set.
- the user interface in the terminal covering a wider field than just conditional access
- the user interface concerns on the one hand the dialogs concerning the purchase of programs ("pay per view", consultation of rights already acquired , ...), and on the other hand the presentation of the program offer, commonly called “EPG”("Electronic Program Guide"), which describes in particular the conditions for marketing future programs;
- EPG Electronic Program Guide
- the user interface involves data conveyed in the signal, "content” information extracted from the ECM or specific to the program offer, possibly supplemented with data describing the presentation modes (download of the man / machine interface).
- these entities may be implicit, such as the identification of services in SECAM, or absent, such as user interface data (native presentation methods in the terminal) .
- this model does not prejudge the coding of these entities (analog video in D2- MAC / Packet or digital in MPEG2 / DVB, offers teletext programs in D2-MAC / Packet or in "SI EIT tables" in MPEG2 / DVB).
- FIG. 4 can take two forms (a) or (b):
- the case “a” is the direct application of the model to the coexistence of two programs in the same signal: the program PI is associated with the conditional access system "a", (block 41), the program P2 with the system d 'conditional access "b” (block 42); • case “b” is functionally identical to the previous one.
- the links specific to the two programs PI (block 43), P2 (block 44) are grouped in a service identification block common to the entire signal; in addition, a complementary service 46 is created which unites the EMM flows (EMMa and EMMb), all conditional access systems combined; this case "b” corresponds to a more realistic case such as that of MPEG2 / DVB. Applying this model to a program in
- the program PI includes components and link data 50 due to the implementation of conditional access, data 52 specific to the conditional access system a, and data 53 specific to the access system conditional b.
- Such a signal has two major features:
- the scrambling of a component, or of a group of components sharing the same access condition is particularized by a control word CW which parameters the behavior of the scrambler and the descrambler. It is therefore necessary that the ECM messaging of each conditional access system refers to the same control words, in a synchronized manner.
- the succession of ECMs of the access system has respectively 64, 65, 66,
- the component / access condition links define which are the clear or scrambled components, and how they are distributed among the access conditions.
- This organization is the same for all conditional access systems in the program. All operators must build their marketing on the same organization of the program: this prohibits, for example, that a television program is marketed simultaneously by an operator according to the organization: image accessible by subscription, sound in clear, subtitle in clear, by another operator according to the organization: image and sound accessible by subscription, clear caption, by a third according to the organization: image and sound accessible by subscription, subtitle in "pay per view”.
- the components 70 and the links 71 are imposed on all the operators.
- the conditional access system 72 is defined by the operator A and the conditional access system 73 is defined by the operator B.
- secondary operators must comply with the use of the control words used by the master operator. In addition, they must base their marketing of the components on that which has been defined by the master operator. Finally, not directly controlling the programming of programs, these secondary operators face the problem of synchronization with program changes.
- SIMULCRYPT has been implemented at the coding point of the master operator which is accessed by the secondary operators. This requires various conditions:
- an architecture of the coding point adapted to SIMULCRYPT in particular, this architecture must include an internal distribution of control words, have multiple conditional access data inputs (several ECM or EMM data streams, etc.), and propose synchronization mechanisms to operators; • the location of ECM messaging generators at 1 Master operator, in order to have control words (these can hardly be deported because of their strategic role and the risks of piracy): such generators can have their own secrets to each operator;
- the object of the present invention is precisely to avoid this drawback, by attenuating this subjugation of the secondary operators.
- SIMULCRYPT To limit the relationships of dependence between operator-master and operators-secondary, one dissociates the constitution of a program and its passage in SIMULCRYPT.
- SIMULCRYPT the predominant role of the master operator cannot be removed since the latter controls the source of the program, but this preponderance can be mitigated by the use of autonomous equipment allowing an operator -secondary to apply your SIMULCRYPT: the dependency relationship between operator-master and operator-secondary is then reduced to the purchase of the program by the former by the latter, a situation analogous to that encountered in the implementation of the so-called transcontrol operation.
- the subject of the present invention is a method for assigning complementary conditional access to a television program already in conditional access, this television program initially comprising:
- an access title control messaging expressing the conditions for marketing the program
- an access title management messaging system comprising data ensuring the management of rights acquired by a user, - possibly, a set of data identifying the services offered and / or supplementing the description of the program offer, characterized by the fact that:
- this program is received in means containing the access rights corresponding to the first conditional access system
- additional access control messages are calculated by taking into account the conditions of the complementary conditional access system and an additional access control messaging service is created,
- an additional messaging system for managing access titles specific to the complementary conditional access system is produced and, optionally, a complementary set identifying the services offered in the complementary conditional access system,
- the program is re-broadcast with its components unchanged, its access control messaging and its messaging for managing the access titles unchanged and, where applicable, all of the data of the initial television program identifying the services offered and / or completing the description of the program offer, and we add the additional access control messaging, the additional messaging for managing access titles and, if applicable where appropriate, the complementary set of data specific to the complementary conditional access system
- the present invention also relates to equipment for the implementation of this method.
- FIG. 7, already described, illustrates the general organization of a program in
- FIG. 8 is a general diagram showing the place of equipment according to the invention
- FIG. 9 illustrates an example of use of a television signal formed by the method of the invention.
- an equipment 80 called SIMULCRYPTOR, according to the present invention, receiving a program 81 already in conditional access A and delivering a program 82 in conditional access A and conditional access B.
- This conditional access B has was inserted by an operator 83.
- the signal finally obtained can be used as illustrated in FIG. 9.
- this program denoted 1 is referenced 91 and it is associated with other conventional programs, such as a program 2 in conditional access A (referenced 92) and a program 3 in conditional access C (referenced 93). All these programs are carried by a network 94 and distributed:
- Subscriber 96 therefore benefits from the method of the invention, which allows him to access program 1 whereas this program, originally, was only in conditional access A. Thanks to the invention, this program has become accessible to subscriber B by adding the complementary conditional access system
- FIG. 10 illustrates in more detail the method and equipment according to the invention.
- the equipment of the invention called SIMULCRYPTOR, is referenced 100. It is equipped with a daughter card 102A adapted to the access control system A of the upstream operator 105 and with a motherboard 102B, adapted to a access control system B of the local operator 106.
- the SIMULCRYPTER 100 receives a program whose structure is described by block 104. This program is produced by the upstream operator 105, which implements the control system d access A.
- the SIMULCRYPTOR 100 works with a local operator 106, and delivers a program whose structure is described by block 108.
- TS "Transport Stream", as defined in the MPEG2 / DVB standard, after demodulation and channel decoding for the incoming signal and before modulation and channel coding for the outgoing signal; SIMULCRYPTOR equipment can have a demodulation stage and a modulation stage to interface with the upstream and downstream networks, without the general function changing.
- SysA, SysB represent two separate conditional access systems; they can represent the same conditional access system, in which case they are differentiated by a specific implementation (for example: two different crypto-algorithms); the first system, SysA, is linked to the upstream operator 105, the second, SysB, is the complementary system added to the program and linked to the local operator 106.
- the daughter card 102A is a security processor containing the rights acquired by the local operator, which behaves like a client of the upstream operator; after comparison of the rights it has with the access conditions contained in the incoming SysA ECMs, the daughter card triggers the cryptographic processing to restore each CW control word.
- the motherboard 102B is a security processor placed under the control of the local operator; it provides the cryptographic processing involved in the development of locally produced SysB ECMs. Illustrated in the case of a single program, this processing can be applied to several programs of the same TS.
- SysA conditional access
- MULTICRYPT conditional access messaging
- SIMULCRYPT therefore consists in adding to the signal all the data relating to the SysB system and to the corresponding program offer: ECM? - EMM, signaling, private data.
- the elements of the signal concerned by the method of the invention are: • the components of the program: their characteristics (coding, content, in clear or scrambled, association with access conditions) remain unchanged;
- SysB ECM consistent with the components of the program (same control word CW) and the commercial terms of the local operator;
- EMMs SysA EMMs carried in the signal remain unchanged; the SIMULCRYPTOR adds SysB EMMs defined by the local operator according to its own customer management strategy and generated by a local rights chain;
- SysB may require the local insertion of private data (individual messaging, etc.).
- FIG. 11 The processing of ECM and EMM in a SIMULCRYPTER is illustrated in FIG. 11. There is the equipment 100, the daughter card 102A, the mother board 102B. In addition, there appears an operator interface 110 B, a circuit 112 for extracting and processing ECM type A, a circuit 114 for generating ECM type B, a circuit 116 for processing EMM with a door. OR 118 receiving local EMMs.
- ECM treatment means include three parts:
- ECM selection this involves defining which services and which components in a service are to be treated; according to the variants, these choices are implicit (all services, image and first sound, %) or explicit and made by the operator on interpretation of the PSI / SI data;
- EMM processing consists of either letting incoming EMM pass through transparently, or eliminating them and possibly inserting EMMs from operator B.
- incoming EMMs are applied to the daughter card for rights management of it. The same is true for any EPG data.
- a SIMULCRYPTOR requires real-time processing to update the signaling (PSI / SI tables) and possible incorporation of local private data (EPG), within the reach of those skilled in the art.
- This modification in real time of the signaling is analogous to that carried out by another type of equipment called transmodulator, ensuring the adaptation for an existing signal of the signaling when switching from one network (satellite for example) to another (cable for example): extract the tables, modify them, insert their new version in the signal. If the precise processing of modification of the tables is different (action on the content of PMT and CAT, ...), the extraction and insertion functions are comparable.
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- Databases & Information Systems (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69726429T DE69726429D1 (de) | 1996-08-20 | 1997-08-19 | Verfahren und vorrichtung zur zuweisung von komplementären zugangsbedingungen für ein fernsehprogramm mit bedingtem zugang |
EP97937639A EP0920777B1 (fr) | 1996-08-20 | 1997-08-19 | Procede et equipement pour affecter a un programme de television deja en acces conditionnel un acces conditionnel complementaire |
CA002263753A CA2263753C (fr) | 1996-08-20 | 1997-08-19 | Procede et equipement pour affecter a un programme de television deja en acces conditionnel un acces conditionnel complementaire |
US09/147,700 US6307939B1 (en) | 1996-08-20 | 1997-08-19 | Method and equipment for allocating to a television program, which is already conditionally accessed, a complementary conditional access |
NO19990738A NO321956B1 (no) | 1996-08-20 | 1999-02-17 | Fremgangsmate og anordning for a tildele en komplementaer betinget tilgang til et fjernsynsprogram allerede underlagt betinget tilgang |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR96/10302 | 1996-08-20 | ||
FR9610302A FR2752655B1 (fr) | 1996-08-20 | 1996-08-20 | Procede et equipement pour affecter a un programme de television deja en acces conditionnel un acces conditionnel complementaire |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998008341A1 true WO1998008341A1 (fr) | 1998-02-26 |
Family
ID=9495123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/001502 WO1998008341A1 (fr) | 1996-08-20 | 1997-08-19 | Procede et equipement pour affecter a un programme de television deja en acces conditionnel un acces conditionnel complementaire |
Country Status (7)
Country | Link |
---|---|
US (1) | US6307939B1 (fr) |
EP (1) | EP0920777B1 (fr) |
CA (1) | CA2263753C (fr) |
DE (1) | DE69726429D1 (fr) |
FR (1) | FR2752655B1 (fr) |
NO (1) | NO321956B1 (fr) |
WO (1) | WO1998008341A1 (fr) |
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US8879893B2 (en) | 2008-07-02 | 2014-11-04 | France Brevets | Scrambling and descrambling method for the transport of MPEG2 audio video data streams |
Also Published As
Publication number | Publication date |
---|---|
EP0920777A1 (fr) | 1999-06-09 |
EP0920777B1 (fr) | 2003-11-26 |
NO321956B1 (no) | 2006-07-31 |
FR2752655A1 (fr) | 1998-02-27 |
CA2263753A1 (fr) | 1998-02-26 |
NO990738L (no) | 1999-04-19 |
FR2752655B1 (fr) | 1998-09-18 |
NO990738D0 (no) | 1999-02-17 |
US6307939B1 (en) | 2001-10-23 |
CA2263753C (fr) | 2005-11-08 |
DE69726429D1 (de) | 2004-01-08 |
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